Patch intelligence record
Windows 11 25H2 (Build 26200.8039)
Current reports mention update/install failure, performance regression, and unspecified windows issue. This page covers one cumulative update, not the whole 25H2 servicing train; reports about a later update are counted on that update's own page.
Recommendations
- Pause updates if this machine is doing deadline-sensitive or production work.
- Check Microsoft's known-issue and safeguard-hold list for this KB before installing.
- Keep the uninstall path in mind: a cumulative update can be removed from Settings > Windows Update > Update history for a limited window after installation.
Current reports mention update/install failure in windows update, performance regression, unspecified windows issue in Windows workflow.
Too few reports for a firm verdict yet — treat this as early evidence.
- Accepted reports
- 7
- Latest evidence run
- Oct 6, 2026
- Healthy sources
- 2 fresh (success / no reports) · need 2
- Microsoft Q&A (search) Checked — no reports found last checked Oct 6, 2026
- techcommunity windows sitemap Checked — no reports found last checked Oct 6, 2026
Monitoring reflects community-evidence collection health for this exact release — an absence of reports is not a safety guarantee, and this is separate from the AUXSAYS verdict.
Vendor Known Issues — No vendor-known issue data captured for this patch.
AUXSAYS has not captured official issue data for this patch. This does not indicate the vendor has no issues. Not counted as community reports.
Official Patch Notes — vendor release notes captured from the official source
Windows 11 25H2 cumulative update, OS build 26200.8039 (KB5085516). Released 2026-03-21 on the General Availability Channel. Update type 2026-03 OOB. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page.
Windows 11 in these notes: .
Windows 11 25H2 cumulative update, OS build 26200.8039 (KB5085516). Released 2026-03-21 on the General Availability Channel. Update type 2026-03 OOB. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page.
Technical Details
- Released
- Mar 21, 2026
- File size
- Official source checked
- Oct 6, 2026
- Official notes checked
- Oct 6, 2026
Checksum
Use these hashes to verify downloaded installers match the files published with the official release.
User Reports / Sources (7)
User report sources used for the current read.
- Microsoft Learn Q&A. (2026, April 13). windows 11 2026-03 Update (KB5085516) (26200.8039) will not install. - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2026, April 7). Critical Issue with Windows 11 24H2 / 25H2 – System Crashes & Performance Issues - Microsoft Q&A. microsoft learn qna Issue: performance regression Workflow: performance
- Microsoft Learn Q&A. (2026, April 4). windows update not complete is give me message is retry is error no.2026-03 Update (KB5085516) (26200.8039) - Microsoft Q&A. microsoft learn qna Issue: unspecified windows issue in Windows workflow Workflow: Windows workflow
- Microsoft Learn Q&A. (2026, March 29). Install error - 0x800f0922 - Microsoft Q&A. microsoft learn qna Issue: boot failure in startup / boot Workflow: startup / boot
- Microsoft Learn Q&A. (2026, March 27). KB5085516 on build 26200.7922 fails to install - error code 0x800f0991 and 0x8024001e - Microsoft Q&A. microsoft learn qna Issue: update/install failure in windows update Workflow: windows update
- Microsoft Learn Q&A. (2026, March 25). Upcoming Taskbar Rearrangement - Microsoft Q&A. microsoft learn qna Issue: display regression in display / graphics Workflow: display / graphics
- Microsoft Learn Q&A. (2026, April 6). Windows 11 Bluetooth A2DP regression between builds 26200.8037 and 26200.8039 – Samsung HW-J250 audio failure - Microsoft Q&A. microsoft learn qna Issue: audio regression Workflow: audio
Official sources
- Microsoft. (2026, March 21). Windows 11 release information.release health
- Microsoft. (2026, March 21). Windows release health.release health
- Microsoft. Download page.download